I have a form with a one2many(List1) list. On this screen I also have form view(tree). I'm wondering if It would be possible to "Add An Item" programmatically based on what is selected on "List1".

The Form View has two items, the first one is related to the one2many(List1) as a many2one(Item1), the other is a value.

What I like to do is based on the List1, it would populate the Tree with Item1's that are related to List1. This way I wouldn't have to have the user have to keep clicking the ADD AN ITEM and selecting the ITEM1 which can be several.